Phil Halstead ’54 of Littleton, Colo., died on May 4, 2010. He was born in 1933 in Flushing, N.Y., and earned a professional degree from Mines in geological engineering. His specialty of integrating data from diverse disciplines resulted in his contributing to the discovery of billions of barrels of oil and trillions of cubic feet of gas in the United States and oversees. He was employed with Chevron as a geologist and a seismic interpreter before joining Statoil, the Norwegian state oil company, as manager of exploration during the company’s formative years. He assisted in Statoil’s initial success of finding reserves in excess of 1 billion barrels of oil and oil equivalents. Upon his return to the United States, he provided geological, geophysical and petrophysical consultation and mapping services from his Denver-based consulting companies, Halstead Reservoir Services and Halstead Exploration. He published on the use of seismic stratigraphic techniques for reservoir mapping. Using these techniques and others, he was responsible for determining oil and gas reserves for governments and oil industry clients. Phil was a member of the Societies of Exploration Geophysicists and Petroleum Engineers as well as the America Association of Petroleum Geologists. He is survived by his wife, Sheila; son, Duncan; daughters, Kaitrin Kuchera and Megan Richardson; and six grandchildren.